Overview
The SN74LVC1T45DPKR, produced by Texas Instruments, is a single-bit, dual-supply, noninverting bus transceiver. This device is designed for asynchronous communication between two data buses and supports universal low-voltage bidirectional translation between various voltage nodes (1.8V, 2.5V, 3.3V, and 5V). The A port and B port are powered by separate configurable power-supply rails, VCCA and VCCB, respectively, each accepting any supply voltage from 1.65V to 5.5V. The direction-control (DIR) input determines the direction of data transmission between the A and B ports.
Key Specifications
| Parameter | Description |
|---|---|
| VCCA and VCCB Range | 1.65V to 5.5V |
| Data Rate | Up to 420Mbps (3.3V to 5V translation), 210Mbps (translate to 3.3V), 140Mbps (translate to 2.5V), 75Mbps (translate to 1.8V) |
| ESD Protection | 2000V Human-Body Model, 200V Machine Model, 1000V Charged-Device Model |
| Output Drive | ±24mA at 3.3V |
| Power Consumption | Maximum ICC of 4µA |
| Package Types | SOT, SOT-23, SC70, USON, DSBGA |
| Package Size (USON) | 1.6mm × 1.6mm |
| Ioff | Supports partial-power-down mode operation |
Key Features
- Fully configurable dual-rail design allowing each port to operate over the full 1.65V to 5.5V power-supply range.
- VCC isolation feature – if either VCC input is at GND, both ports are in the high-impedance state.
- DIR input circuit referenced to VCCA.
- Low power consumption with a maximum ICC of 4µA.
- High-speed data rate support up to 420Mbps.
- ESD protection exceeds JESD 22 standards.
- Available in Texas Instruments NanoFree™ package.
- Supports partial-power-down mode operation with Ioff.
- Balanced high-drive CMOS push-pull outputs.
Applications
The SN74LVC1T45DPKR is suitable for various applications requiring voltage level translation between different voltage nodes. These include:
- Asynchronous communication between two data buses.
- Universal low-voltage bidirectional translation in systems using 1.8V, 2.5V, 3.3V, and 5V voltage nodes.
- Enterprise and telecom systems where high-speed data translation is necessary.
- Any system requiring ESD protection and low power consumption.
Q & A
- What is the voltage range for VCCA and VCCB in the SN74LVC1T45DPKR? The voltage range for both VCCA and VCCB is from 1.65V to 5.5V.
- What are the maximum data rates supported by the SN74LVC1T45DPKR? The device supports data rates up to 420Mbps (3.3V to 5V translation), 210Mbps (translate to 3.3V), 140Mbps (translate to 2.5V), and 75Mbps (translate to 1.8V).
- What is the ESD protection level of the SN74LVC1T45DPKR? The device has ESD protection exceeding JESD 22 standards: 2000V Human-Body Model, 200V Machine Model, and 1000V Charged-Device Model.
- How does the DIR input control data transmission in the SN74LVC1T45DPKR? The DIR input determines the direction of data transmission; a high level allows data transmission from A to B, and a low level allows data transmission from B to A.
- What is the maximum output drive capability of the SN74LVC1T45DPKR? The device has an output drive capability of ±24mA at 3.3V.
- What is the power consumption of the SN74LVC1T45DPKR? The maximum power consumption (ICC) is 4µA.
- Does the SN74LVC1T45DPKR support partial-power-down mode operation? Yes, the device supports partial-power-down mode operation with Ioff.
- What are the available package types for the SN74LVC1T45DPKR? The device is available in SOT, SOT-23, SC70, USON, and DSBGA packages.
- What is the size of the USON package for the SN74LVC1T45DPKR? The USON package size is 1.6mm × 1.6mm.
- What is the purpose of the VCC isolation feature in the SN74LVC1T45DPKR? The VCC isolation feature ensures that if either VCC input is at GND, both ports are in the high-impedance state.
